CN100549698C - Displacement transducer and Windows time indirect velocity test method - Google Patents
Displacement transducer and Windows time indirect velocity test method Download PDFInfo
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- CN100549698C CN100549698C CNB2007100189475A CN200710018947A CN100549698C CN 100549698 C CN100549698 C CN 100549698C CN B2007100189475 A CNB2007100189475 A CN B2007100189475A CN 200710018947 A CN200710018947 A CN 200710018947A CN 100549698 C CN100549698 C CN 100549698C
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Abstract
The invention discloses the method for a kind of displacement transducer and Windows time indirect measuring speed, this method be displacement transducer with link to each other with tested steering wheel output terminal, the displacement conversion of tested steering wheel output terminal is become voltage or current signal, and this signal is sent to the A/D modular converter that is installed on the observing and controlling computing machine, convert displacement signal to digital quantity by the A/D modular converter.The observing and controlling computing machine is gathered displacement according to certain rules, uses the GetCurrentTime function among the Windows API to read the Windows time immediately after gathering displacement, is defined as this position time corresponding.The observing and controlling computing machine is divided by by displacement difference on the adjacent two positions and mistiming and calculates the average velocity that tested steering wheel output terminal moves between two positions point.
Description
Technical field
The present invention relates to a kind of indirect velocity test method, particularly a kind of method of displacement transducer and Windows time indirect velocity test when being used to test steering wheel output terminal speed.
Background technology
In the velocity test process of steering wheel output terminal, classic method is to adopt speed pickup directly to test, this method is when test steering wheel output terminal speed relatively large (for example: unloaded output speed maximal value can reach 100mm/s), and measuring accuracy can also reach requirement; But in some test event, tested speed is less relatively (for example: in the starting current test, tested speed is about 0.5mm/s) time, speed pickup (for example: in the starting current test as will reach 1% measuring accuracy must reach very high measuring accuracy, for full scale is the speed pickup of 100mm/s, its full scale precision will be up to 0.005%), the speed pickup of this moment can't reach accuracy requirement at all.For this reason, can adopt other indirect velocity test method, the appearance that avoids this problem, and the indirect velocity test method among the present invention just can address this problem well.
Summary of the invention
The problem that the velocity accuracy that adopts speed pickup to test the steering wheel output terminal at above-mentioned existing classic method can not meet the demands, the objective of the invention is to, the method of a kind of displacement transducer and Windows time indirect velocity test is provided, this method adopts computer autocontrol technique, do not need at steering wheel output terminal acceleration transducer in addition, in test process, record steering wheel output terminal displacement of observing and controlling computing machine instantaneous acquiring and Windows time, the displacement that will be used to test the displacement transducer test of steering wheel output terminal displacement is divided by at interval with move the pairing Windows time of this section displacement (refer to pass millisecond number) after Windows system start-up, determines a kind of indirect velocity test method of steering wheel output terminal average velocity.The too low problem of precision when testing with speed pickup when this method can solve packaged actuators output terminal velocity test.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of displacement transducer and Windows time indirect velocity test method, this method is used to test steering wheel output terminal speed, it is characterized in that:
At first displacement transducer is linked to each other with tested steering wheel output terminal, the displacement conversion of tested steering wheel output terminal is become voltage or current signal, and this signal is sent to the A/D modular converter that is installed on the observing and controlling computing machine, convert displacement signal to digital quantity by the A/D modular converter.
The observing and controlling computing machine is gathered displacement according to certain rules, uses the GetCurrentTime function among the Windows API to read the Windows time immediately after gathering displacement, is defined as this position time corresponding.The observing and controlling computing machine is divided by by displacement difference on the adjacent two positions and mistiming and calculates the average velocity that tested steering wheel output terminal moves between two positions point, and outputs test result on the human-computer interaction interface of observing and controlling computing machine.
Specifically may further comprise the steps:
Step 1 is pressed the testing button on the human-computer interaction interface of observing and controlling computing machine, and testing software is provided with timer break period and opening timing device;
Does step 2 judge whether to receive that timer interrupts? if receive that timer interrupts then each collection period acquisition and recording one secondary data of observing and controlling computing machine, the output shift quantity S of each acquisition and recording steering wheel output terminal displacement transducer
i, exist side by side and promptly use the GetCurrentTime function among the Windows API to read the Windows time t corresponding with it
iOtherwise Control Software is handled other task;
Does step 4 judge whether timer closes? if do not close then return step 2 and continue test, otherwise finish test.
When usefulness displacement transducer that the present invention provides and Windows time indirect velocity test method test steering wheel output terminal speed, do not need at steering wheel output terminal acceleration transducer in addition, utilization is installed on the displacement transducer and the Windows time of steering wheel output terminal, determine steering wheel output terminal speed, overcome traditional test and adopted the too low shortcoming of speed pickup precision, improved the precision and the accuracy of test.
Description of drawings
Fig. 1 is a steering wheel output terminal velocity test functional-block diagram;
Fig. 2 is a steering wheel installation test stand synoptic diagram;
Fig. 3 is a steering wheel output terminal velocity test process flow diagram;
The present invention is described in further detail below in conjunction with accompanying drawing and specific implementation method.
Embodiment
Method of the present invention does not need at steering wheel output terminal acceleration transducer in addition, in test process, record steering wheel output terminal displacement of observing and controlling computing machine instantaneous acquiring and Windows time, the displacement that will be used to test the displacement transducer test of steering wheel output terminal displacement is divided by at interval with move the pairing Windows time of this section displacement (refer to pass millisecond number) after Windows system start-up, determines a kind of indirect velocity test method of steering wheel output terminal average velocity.
The measuring accuracy of this indirect velocity test method is not subjected to the displacement transducer error effect substantially, but the time test error is bigger to the measuring accuracy influence of speed.Clock in the test development instrument (as LabWindows/CVI) has higher precision (ms level), it can produce a clock interrupt message accurately in the time that the user sets, this message enters the windows messaging formation, if before this message, there is not other message to exist, Windows this message that will make an immediate response; Finish acquisition and recording steering wheel output terminal displacement measurement and Windows time task that testing software determines, in the software between acquisition and recording steering wheel output terminal displacement measurement and the task of Windows time without any other message, in this case, test displacement and time coordinate; If but before the clock interrupt message, have other message to exist, Windows only just responds the clock interrupt message after having responded other message so, finish the displacement measurement task of determining in the testing software, in this case, test displacement and time are inharmonic, may exist than large deviation between speed that calculates and the actual speed.
For guaranteeing test displacement and the coordination of Windows time, eliminate test error, testing table has adopted displacement transducer and Windows time indirect velocity test method.In test process, the displacement transducer test data of acquisition and recording steering wheel output terminal and read Windows and do not add any operation between the time in the testing software, thereby guaranteed test displacement and the coordination of time, avoided the test error that produces because of both are inharmonious.
Steering wheel output terminal velocity test functional-block diagram as shown in Figure 1.Displacement transducer is gathered the A/D modular converter input end (input 0～5V) that steering wheel output terminal stroke signal enters the observing and controlling computing machine, (output signal 0～20mA) is sent into the manipulation relay by amplifying conditioning module to the D/A modular converter output terminal of observing and controlling computing machine, the observing and controlling computer recording is handled the data of observing and controlling computer acquisition, outputs test result at last.
The software of observing and controlling computing machine adopts following method to finish: testing software adopts based on the LabWindows/CVI virtual instrument software of the America NI company of C language and designs and develops; Be provided with a clock in the software and be used for the specified data collection period, design the interior relay coil Control current of handling of every mistake one data collection cycle and change by rule; While data such as output terminal displacement of acquisition and recording steering wheel and Windows time in each collection period; At last data are carried out process of fitting treatment and net result is exported.Develop software based on the C language, its have readable strong, be easy to characteristics such as management, modular design easily, for example use call back function in the software design in a large number as subfunction; Function also is easily understood in the developing instrument, for example curve plotting function PlotXY judges value function MaxMin1D, and iunction for curve PolyFit etc. (can examine China Machine Press with reference to 1., Song Yufeng etc. write, and LabWindows/CVI progressively gos deep into and developing example; 2. Electronic Industry Press, Sun Xiaoyun etc. write, based on the Design of Virtual Instrument of LabWindows/CVI and application etc.).
Steering wheel installation test stand synoptic diagram as shown in Figure 2, comprise fixed support 1, support promotes wheel 2, anchor post 3, control operating rod erection support 4, the input Rocker arm 5, load bar 6, displacement transducer 7 slide block mechanisms 8, what be used to install steering wheel hangs 9, steering wheel holder 10, pumping plant performance test hydraulic system cabinet 11, tested steering wheel 12.Wherein the output terminal of slide block mechanism 8 and tested steering wheel 12 is connected, and and displacement transducer one work and measure the displacement of tested steering wheel output terminal, then displacement signal is sent to the observing and controlling computing machine and carries out recording processing.
Steering wheel output terminal velocity test has maximum unloaded velocity test and damping state speed gain test.
Maximum unloaded velocity test concrete operations are as follows: 1) installation position displacement sensor on the steering wheel hydraulic test bench, force transducer is not installed, and do not connect pumping plant testing hydraulic system.2) proportional throttle valve control--automatically; Security of system pressure---automatically; Air cooler control---automatically; Damper Control---automatically; Handle relay excitation coil---automatically; Handle the relay coil electric current---automatically.3) start Electric Machine at Pumping Station.4) press " beginning test " button.5) import pull bar to 3 circulations of extreme position with the prestissimo reciprocating sliding.6) measured position Mobile Communication crosses displacement transducer and is sent to the observing and controlling computing machine, and the observing and controlling computing machine to the Windows time keeping, is handled data simultaneously at last, finally obtains the maximum no-load speed of steering wheel.7) press " stop test " button, finish test and show test results.
Damping state speed gain test needs the size of test steering wheel starting current, adopt threshold speed backstepping to test the starting current of steering wheel automatically, concrete operations are as follows: 1) installation position displacement sensor on the steering wheel hydraulic test bench, force transducer is not installed, and do not connect pumping plant testing hydraulic system.2) proportional throttle valve control---automatically; Security of system pressure---automatically; Air cooler control---automatically; Damper Control---automatically; Handle relay excitation coil---automatically; Handle the relay coil electric current---automatically.3) start Electric Machine at Pumping Station.4) pressing " begin test " button respectively controls output channel and forces to be set to " automatically ", manipulation relay coil electric current :-13mA (3s);-6mA～6mA (6s);-13mA (3s); + 13mA (3s); 0mA (3s); In the 3s～9s process, the position S of observing and controlling computer recording output Control current, collection steering wheel output terminal displacement transducer
iWith its corresponding Windows time t
iThe 18th second, the observing and controlling computing machine carried out data processing, calculated the average velocity of steering wheel output terminal
Judge the speed v of the steering wheel output terminal of surveying
i〉=v
ThresholdThe time, can determine that the current value of the last test point correspondence of threshold speed is steering wheel starting current I
I-15) system finishes test automatically in 18 seconds, and shows test results.
Displacement transducer and Windows time indirect velocity test method flow diagram are as shown in Figure 3 during test aircraft packaged actuators output terminal speed of the present invention.
When the unloaded velocity test of maximum, specifically may further comprise the steps:
1) presses " begin test " button on the human-computer interaction interface;
2) import bar to 3 circulations of extreme position with maximal rate reciprocating sliding steering wheel;
3) meanwhile, the every 0.1s of observing and controlling computing machine gathers a secondary data, gathers the position S of steering wheel output terminal displacement transducer at every turn
iWith its corresponding Windows time t
i
4) the observing and controlling computing machine carries out data processing, calculates the average velocity of steering wheel output terminal
5) in all deal with data, that speed that the observing and controlling computing machine is found out all speed absolute value maximums is the no-load speed maximum;
6) on human-computer interaction interface, show steering wheel output terminal speed result.
Damping state speed gain test needs the size of test steering wheel starting current, adopts threshold speed backstepping to test the starting current of steering wheel automatically.Specifically may further comprise the steps:
1) presses " begin test " button on the human-computer interaction interface;
2) observing and controlling computer control steering wheel is handled the relay coil Control current by following rule variation :-13mA (3s);-6mA～6mA (6s);-13mA (3s); + 13mA (3s); 0mA (3s).
3) in the 3s～9s process, the position S of observing and controlling computer recording output Control current, collection steering wheel output terminal displacement transducer
iWith its corresponding Windows time t
i
4) the observing and controlling computing machine carries out data processing, calculates the speed of steering wheel output terminal
5) the observing and controlling computing machine carries out the data analysis processing, when the speed v of judging the steering wheel output terminal of surveying
i〉=v
ThresholdThe time, can determine that the current value of the last test point correspondence of threshold speed is steering wheel starting current I
I-1, and this steering wheel starting current result shown on the human-computer interaction interface of observing and controlling computing machine.
When the method with displacement transducer and Windows time indirect velocity test that adopts the present invention to provide is tested steering wheel output terminal speed, do not need at steering wheel output terminal acceleration transducer in addition, in test process, utilization is installed on the displacement transducer and the Windows time of steering wheel output terminal, determine steering wheel output terminal speed, overcome traditional test and directly adopted the too low shortcoming of speed pickup precision, the too low problem of precision when testing with speed pickup when having solved packaged actuators output terminal velocity test has improved the precision and the accuracy of test.The hydraulic sterring engine testing table of being developed adopts observing and controlling computer bus and virtual test technology, has well test and display capabilities automatically, and is easy to operate, man-machine interface close friend.
Claims (1)
1. displacement transducer and Windows time indirect velocity test method, this method is used to test steering wheel output terminal speed, it is characterized in that:
At first displacement transducer is linked to each other with tested steering wheel output terminal, the displacement conversion of tested steering wheel output terminal is become voltage or current signal, and this signal is sent to the A/D modular converter that is installed on the observing and controlling computing machine, convert voltage or current signal to digital quantity by the A/D modular converter;
The observing and controlling computing machine is gathered displacement according to certain rules, after gathering displacement, use the GetCurrentTime function among the Windows API to read the Windows time immediately, be defined as this position time corresponding, the observing and controlling computing machine is divided by by displacement difference on the adjacent two positions and mistiming and calculates the average velocity that tested steering wheel moves between two positions point, and on the human-computer interaction interface of observing and controlling computing machine, output test result, specifically may further comprise the steps:
Step 1 is pressed the testing button on the human-computer interaction interface of observing and controlling computing machine, and testing software is provided with timer break period and opening timing device;
Do step 2, observing and controlling computing machine judge whether to receive that timer interrupts? if receive that timer interrupts then each collection period acquisition and recording one secondary data of observing and controlling computing machine, the output shift quantity S of each acquisition and recording steering wheel output terminal displacement transducer
i, exist side by side and promptly use the GetCurrentTime function among the Windows API to read the Windows time t corresponding with it
iOtherwise Control Software is handled other task;
Step 3, the observing and controlling computing machine carries out data processing, uses formula
Computing velocity and display result;
Does step 4 judge whether timer closes? if do not close then return step 2 and continue test, otherwise finish test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100189475A CN100549698C (en) | 2007-10-26 | 2007-10-26 | Displacement transducer and Windows time indirect velocity test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100189475A CN100549698C (en) | 2007-10-26 | 2007-10-26 | Displacement transducer and Windows time indirect velocity test method |
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| Publication Number | Publication Date |
|---|---|
| CN101183117A CN101183117A (en) | 2008-05-21 |
| CN100549698C true CN100549698C (en) | 2009-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100189475A Expired - Fee Related CN100549698C (en) | 2007-10-26 | 2007-10-26 | Displacement transducer and Windows time indirect velocity test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014196925A1 (en) * | 2013-06-03 | 2014-12-11 | Ctrlworks Pte. Ltd. | Method and apparatus for offboard navigation of a robotic device |
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